The all-time winningest pitcher in West Chester University baseball history, he still holds four career records and one season record 11 years after his graduation. Along with his 30 career victories on the mound for the Golden Rams, he also holds records for the most career shutouts (10) and most complete games (24) while logging a school-record 298.1 innings pitched from 2002-2005. His five shutouts in 2004 is a single-season record at West Chester. That year, he led all of NCAA Division II in earned run average with a mark of 0.99. He is the only pitcher to register double figures in wins twice in his career, winning 10 games in both 2004 and 2005.
 
Brennan graduated with an overall record of 30-13. He was a three-time All-PSAC East selection and twice named to the first team in the Eastern Division. He went 10-1 with a 0.99 ERA in 2004, completing eight of his 11 starts, to earn the PSAC Athlete of the Year award in baseball. West Chester won more than 30 games all four years he donned the Purple & Gold, reaching the NCAA Regionals in both his junior and senior seasons.